Polystichum braunii (Spenn.) Fée
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Rhizome erect, lvs 3–9 dm; petiole 13–18 cm, densely scaly; blade lanceolate, 7–17 cm wide, acuminate, reduced below, essentially bipinnate; pinnae 30–40 pairs, acuminate, alternate above, the lower subopposite; pinnules 9–15 pairs on the larger pinnae, ovate-deltoid to ovate-oblong, acute, spinulose-denticulate with incurved teeth, the veins of both surfaces bearing linear scales; sori in one row on each side of the midrib; indusium pale, sublobate; 2n=164. Upland woods and rock ledges in circumneutral soil; circumpolar, s. to Mass., N.Y., Pa., Mich., Wis., and n. Minn. The Amer. plants differ slightly from the Eurasian ones and have been segregated as var. purshii Fernald. A hybrid with no. 1 [Polystichum acrostichoides (Michx.) Schott] is P. ×potteri Barrington.